# Patterns/facade

> Facade Pattern pattern for C development

- Skill: `majiayu000/patterns-facade` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/patterns-facade`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/patterns-facade/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/patterns-facade

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# Facade Pattern

Provides a simplified interface to a complex subsystem, hiding internal complexity behind a cohesive API. Clients interact with the facade rather than individual components.

## ikigai Application

**Primary facade:** `ik_repl_ctx_t` is a facade over:
- Terminal management (`ik_term_ctx_t`)
- Scrollback buffer (`ik_scrollback_t`)
- Input handling (`ik_input_buffer_t`)
- Layer rendering system
- LLM client interaction
- Conversation state

**User sees:** `ik_repl_init()`, `ik_repl_run()`, `ik_repl_cleanup()`

**Subsystems hidden:** Terminal raw mode, ANSI escapes, viewport calculations, streaming chunk assembly.

**Benefit:** Main only knows about REPL. REPL orchestrates everything else. Changes to internals don't affect main.